Hello,
Your menu goes into two lines cause it has a lot of items and little space to fit.
You can arrange your menu into mega menu sub-items or deactivate “Sticky header clone” in the Header builder setting http://prntscr.com/kmc0en and make each row sticky, in this case, menu will not go in the same row with logo and would not be broken.
Or it is possible to reduce logo and menu font-size, if you want this way, add this code to the Theme settings > Custom CSS
.whb-clone .whb-general-header .woodmart-logo img {
max-height: 25px;
}
.whb-clone .main-nav .item-level-0 > a {
font-size: 11px;
}
Best Regards